<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>搜索框输入文字自动提示</title>
    <!-- <link rel="stylesheet" href="/assets/bootstrap/dist/css/bootstrap.min.css"> -->
    <link href="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/3.4.1/css/bootstrap.min.css" rel="stylesheet">
    <style type="text/css">
        .container {
            padding-top: 150px;
        }
    </style>
</head>

<body>
    <div class="container">
        <div class="form-inline">
            <div class="form-group">
                <select class="form-control" id="province"></select>
            </div>
            <div class="form-group">
                <select class="form-control" id="city">
                    <option>请选择城市</option>
                </select>
            </div>
            <div class="form-group">
                <select class="form-control" id="area">
                    <option>请选择县城</option>
                </select>
            </div>
        </div>
    </div>
    <script src="../js/ajax.js"></script>
    <script src="../js/template-web.js"></script>
    <script type="text/html" id="provinceTpl">
        <!-- 省份模板 -->
    <option>请选择省份</option>
    {{ each province}}
    <option value="{{ $value.id }}">{{ $value.name }}</option>
    {{ /each }}
    </script>

    <script type="text/html" id="cityTpl">
        <!-- 城市模板 -->
    <option>请选择城市</option>
    {{ each city}}
    <option value="{{ $value.id }}">{{ $value.name }}</option>
    {{ /each }}
    </script>

    <script type="text/html" id="areaTpl">
        <!-- 县城模板 -->
    <option>请选择县城</option>
    {{ each area}}
    <option value="{{ $value.id }}">{{ $value.name }}</option>
    {{ /each }}
    </script>


    <script>
        // 获取省市区下拉框元素
        var province = document.getElementById('province');
        var city = document.getElementById('city');
        var area = document.getElementById('area');
        // 获取省份信息
        ajax({
            type: 'get',
            url: 'http://localhost:3000/province',
            success: function (data) {
                // console.log(data);
                // 将服务器端返回的数据与html进行拼接
                var html = template('provinceTpl', { province: data });
                // 将拼接好的html字符串显示在页面中
                province.innerHTML = html;
            }
        });

        // 为省份的下拉框添加值改变事件
        province.onchange = function () {
            // 获取省份id
            var pid = this.value;

            // 清空县城下拉框中的数据
            var html = template('areaTpl', { area: [] });
            area.innerHTML = html;

            // 根据省份id获取城市信息
            ajax({
                type: 'get',
                url: 'http://localhost:3000/cities',
                data: {
                    id: pid
                },
                success: function (data) {
                    console.log(data);
                    var html = template('cityTpl', { city: data });
                    city.innerHTML = html;
                }
            })
        }

        // 当用户选择城市的时候
        city.onchange = function () {
            // 获取城市id
            var cid = this.value;
            // 根据城市id获取县城信息
            ajax({
                type: 'get',
                url: 'http://localhost:3000/areas',
                data: {
                    id: cid
                },
                success: function (data) {
                    var html = template('areaTpl', { area: data });
                    area.innerHTML = html;
                }
            })
        }
    </script>
</body>